At mazang road, there is shell petrol pump, they divert drivers attention to other things to mess up the meter, like, sir app meter saaf kiya karain, sir app kay oil cap pay zung hay, lao yar chotay mobil oil dalo is pay thora sa.
Happened with me 2-3 times, and then i noticed and then i said kay na bhai, asay na karo. its there common practice despite of many fights over this.